wells



@pitch tetes idahni @Him Letters Patent '.ZV'o. 76,123, dated March 31, 1868.

IMPROVED DRILL-GAUGE.

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TO ALL WHOM IT. MAY CONCERN:

Be it known that I, WILLIAM C. WELLS, of Newark, in the county of Essex, in the State of New Jersey, have ;invented certain newand useful' Im'p'rovem'ents on the Drill-Gauge which is described in the drawings and Specifications'accompanying the Letters Patent of W. C. WELLS, issued November 28, 1865, and numbered 51,248, and which is also'further described in the drawings and specifieations accompanying the application for Letters Patent of the said'W. C. WELLS, which application .was filed in the Patent Oihee on the 28th day of December, 1865, and which was ofiicially errarninedand allowed on the 25th day of April, 1 866; and I do hereby declare that the following isa full, clear, and exact description of the construction and operation of the said gauge, as improved, reference being hadto the annexed drawings, making a part of this specification, and tc the letters of reference marked thereon, in which- Figure 1 is aside view of the gauge, with a'drill held iniproper position for gauging, showing the rotating blade A, and stud-screw D upon which the said blade revolves.

Figure 2 is a back View of the instrument, showipg how, with the blade A depressed, it can be used as a ccntring-gauge. b

Figure 3 shows the blade A, supporter M,-stud-screw D separately, with the projections c. c', ou theblade A and supporter M, which, in. combination with the scre'w D, form a pivot or hinge-joint.

Figure 4 is a top View of the instrument when used as a centring-gauge, showing the end of' the cylindrical pieee'e; with the lines g i-g drawn, whose intersection describes the centre'of the piece.

The nature of my idvention consists in forrning a pivot-joint or turning-joint on the blade A and supporter M, which, in combination with 'the stud-screw D,enab les nie to alter the position of the blade A, seas to conform to any desired angle, thereby enlarging the Sphere of usefulness of the instrument herein described.

To enable others to make and use my invention, I W-ill describe its construction and operation.

T0 a V-shaped or concentric guide or holder, B, fig. 2, I attacha supporter, M, upon which I fasten the rotating blade A by means ot' the pivot or studscrew D, which passes through the blade at e, and screws firmly into the ,supporter M at c'. The part of.the supporter M upon which the blade A is fastened, extends backward from the guide B a sulhcient distance to allow thesaid blade to rotate freely. This part of the supporter M is bent in such a manner that, when attached to the guide B, with the blade A fastened upon it, the said blade will be held in a line directly central with the V-part of the guide B, as shown at-g g, fig 4. The supporter M is fastened to the guide B by means of the screw F, which passes through a slot in the supporter M, and screws firmly into the/guide B.' The supporter M is provided with a small flange at its upper and lower extremity, as shown at m m, fig. The upper fiange overlaps the top edge of the guide B, and the lower flange fits in a slot in the said guide, as shown at n, fig. 2, thus forming a sliding joint for the supporter M, yet preventing it' from altering its position in any other respect'. The' supporter M is moved along the side of the guide B, and carries the blade A with it, in a lateral direction to or from the centre of the v-guide, by means of the thumb+ screw .Lfig. 2, which passesthrough a bearing in the guide B, and serews into a stud ou the supporter M. When the blade A is attached to the guide B, the plane of the said blade should be in a` line parallel with the vertical plane' of the said guide B. Upon the face or side'of the blade A, I place marks or indentations, the use of which enables me to ascertain whenthe point of a drill is or is not central. A

To use this' instruuient as a drill-gauge, set the blade Ato the desired angle, grindor file the lip of the drill until it conforms to the angle of the blade, notice'the mark or indentation at which the point of the'drill touches, revolv'e the drill half a t urn;`if the point of the' drill still touches the same mark or indentation,.the point iscentral. To use the instrument as a ccntring-gauge, set the edge of the blade directly overthe centre of the V-guide, depress theblade until it lies across the end of' the -cylindrical piece, as at fig. 2, then, with a sharp scratch-awl, describe the line g' g', fig. 4, reyolveithe piece one-quarter of a turn'and describe the line g g, the intersection of the two lines y+ will' be the centre of the piece.

I 'do not, claim the construction'of h'ccntring-gauge by attaching ::.blade to a V:shaped guide; that,'Iknov r, has been done before. Neither do I claim constructing a. drill-gauge by placing a blade above a v-shaped guide; that has already been done. and claimed in the Letters Patent herein referred to; but

What I .claim as my'improvements, and for which I desii e to obtain Letters Patent, is V 1.' In a'drill-gauge, the employment i' a movable br rotating blade, A, in combination with a v-shaped or concentric guide, B, said blade being movable to oi' from the end of the said guide, above which it is placed ih a, line parallel with the Venticalplane of'the said guide'B fer the purpose of enlarging or diminishing the area of the angle which it is intended to describe, substantially as herein specifiedi 2. I claim the projection c on .the blade A, and projeetion e' on the supporter M,. in connection' witlitlxe stud-screw D,`fig. 3, Which .conjointly forms-a pivob-joint, when the said parts are attached to a concentric guide, as and for the purpbse shown and described. V

WILLIAM C. WELLS. witnesses:

JOHN A. HURLEY,

'JAMES W. Hmmm. 

